{"id":448316,"date":"2021-03-26T13:51:10","date_gmt":"2021-03-26T12:51:10","guid":{"rendered":"https:\/\/hudo.com\/si\/2021\/03\/26\/ne-le-kuzki-in-ljudje-tudi-hobotnice-imajo-zivahne-sanje\/"},"modified":"2021-03-26T13:51:10","modified_gmt":"2021-03-26T12:51:10","slug":"ne-le-kuzki-in-ljudje-tudi-hobotnice-imajo-zivahne-sanje","status":"publish","type":"post","link":"https:\/\/hudo.com\/si\/lifestyle\/ne-le-kuzki-in-ljudje-tudi-hobotnice-imajo-zivahne-sanje\/","title":{"rendered":"Ne le ku\u017eki in ljudje, tudi hobotnice imajo \u017eivahne sanje!"},"content":{"rendered":"

Znanstveniki Mo\u017eganskega instituta na brazilski Univerzi Rio Grande do Norte so na kamero ujeli trenutek, ko je hobotnica, ki je po\u010divala na dnu akvarija, nenadoma spremenila barvo iz blede svetlo zelene v rjavo in nato oran\u017eno, medtem pa so ji trzale mi\u0161ice, priseski so se kr\u010dili, njene zaprte o\u010di pa so se premikale.<\/p>\n

<\/figure>\n

To je znanstvenike napeljalo k primerjavi s fazo REM (rapid eye movement ali hitro premikanje o\u010di), ki jo imajo tudi sesalci, pti\u010di in nekateri plazilci. In to bi lahko pomenilo, da tudi hobotnice sanjajo.<\/p>\n

Preproste \u017eivali s kompleksnim \u017eiv\u010devjem<\/h2>\n

“Hobotnice so edinstvene v smislu njihove kompleksnosti, tako po obna\u0161anju kot nevrolo\u0161ko,” je za francosko tiskovno agencijo AFP ocenil eden vodilnih znanstvenikov v \u0161tudiji Sidarta Ribeiro z omenjenega in\u0161tituta za preu\u010devanje delovanja mo\u017eganov. Poudaril je, da imajo hobotnice najbolj kompleksne mo\u017egane od vseh nevreten\u010darjev.<\/p>\n

Brazilski znanstveniki so sicer v \u0161tudijo vklju\u010dili \u0161tiri hobotnice, ki so jih opazovali ve\u010d dni. Ugotovili so, da so bile te \u017eivali med “tihim spanjem” mirne, njihova ko\u017ea bleda, o\u010desne zenice pa skr\u010dene v tanko re\u017eo. Med aktivno fazo spanja pa so dinami\u010dno spreminjale barvo in teksturo ko\u017ee, mi\u0161ice so jim vidno trzale, o\u010di pa premikale.<\/p>\n

Fazi sta se izmeni\u010dno ponavljali. Tiha faza je trajala okoli \u0161est do sedem minut, nato pa aktivna okoli 40 sekund. Cikel se je nato ponovil ali pa se je hobotnica zbudila. Obi\u010dajno je sicer 30 do 40 minut kasneje znova zaspala. V celoti je tovrstno dremanje trajalo pribli\u017eno \u010detrtino dneva.<\/p>\n

\n\t\t\t\t\t
Profimedia<\/figcaption><\/figure>\n

Da bi ugotovili, ali hobotnice med svojim mirovanjem res spijo, so jih testirali vizualno s prikazom rakovice, njihovega obi\u010dajnega plena. Ko so bile budne, so sku\u0161ale videoposnetek raka napasti, \u010de so spale pa ne. Prav tako so jih preizkusili s trkom gumijastega kladiva ob steno akvarija. Ko so bile budne, so se odzvale in spremenile svojo barvo, ne pa tudi, ko so spale.<\/p>\n

Znanstvenikom bi te ugotovitve lahko pomagale pri odkrivanju evolucijskih poti, je pojasnil Ribeiro. Glavono\u017eci in sesalci so se v evoluciji lo\u010dili pred pribli\u017eno 500 milijoni let, kar pomeni, da je zelo verjetno pri\u0161lo do neodvisnega razvoja enakih biolo\u0161kih mehanizmov.<\/p>\n

“\u010ce vidimo podoben fenomen, v tem primeru spalni cikel, sestavljen iz tihe in nato aktivne faze, je to najverjetneje zaradi konvergentne evolucije,” je pojasnil Ribeiro. Zato bi bilo po njegovih besedah zanimivo ugotoviti, kateri evolucijski pritiski so oblikovali tovrstno obna\u0161anje.<\/p>\n

Za sesalce je faza REM spanja pomembna pri utrjevanju spominov. Med to fazo se spro\u017ei tudi niz molekularnih mehanizmov, ki pomagajo pri ohranjanju zdravja mo\u017eganov in funkcije pomnenja. Znanstveniki zdaj menijo, da se to dogaja tudi pri hobotnicah.<\/p>\n

Vendarle pa zaenkrat ne morejo govoriti tudi o tem, da tudi hobotnice sanjajo, kot je to obi\u010dajno pri ljudeh med njihovo fazo REM spanja. Upajo, da bodo ve\u010d lahko odkrili pri nadaljnjih \u0161tudijah obna\u0161anja teh \u017eivali.<\/p>\n","protected":false},"excerpt":{"rendered":"

Tudi hobotnice sanjajo, ugotavljajo brazilski nevrolo\u0161ki raziskovalci v najnovej\u0161i \u0161tudiji, objavljeni v znanstveni reviji iScience. Ugotovili so, da imajo tudi glavono\u017eci dve fazi spanja, eno zelo podobni t. i. fazi REM, ki jo imajo sesalci, pti\u010di in nekateri plazilci.<\/p>\n","protected":false},"author":1,"featured_media":448317,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1091],"tags":[18534,2089,1645],"source":[1522,1518,1552],"supertag":[],"acf":[],"yoast_head":"\nNe le ku\u017eki in ljudje, tudi hobotnice imajo \u017eivahne sanje! - Hudo Slovenija<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/hudo.com\/si\/lifestyle\/ne-le-kuzki-in-ljudje-tudi-hobotnice-imajo-zivahne-sanje\/\" \/>\n<meta property=\"og:locale\" content=\"sl_SI\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ne le ku\u017eki in ljudje, tudi hobotnice imajo \u017eivahne sanje! - Hudo Slovenija\" \/>\n<meta property=\"og:description\" content=\"Tudi hobotnice sanjajo, ugotavljajo brazilski nevrolo\u0161ki raziskovalci v najnovej\u0161i \u0161tudiji, objavljeni v znanstveni reviji iScience. 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